Re: [Libusb-win32-devel] setConfiguration

[Stephan M. <ste...@we...>]

Try the latest code from the CVS. I modified the driver's set=5Fconfiguratio=
n()
function. The function's bahaviour is now compatible to the Linux version.=


Stephan


> I've spotted what to me seems a pretty major difference between libusb
> and libusb-win32. In the call to set=5Fconfiguration, libusb takes the
> actual configuration value, i.e. the value specified in the
> configuration descriptor, whereas libusb-win32 takes the index value +
> 1.
>=20
> This means that if you have a quirky device which has one configuration
> called configuration 2, then with libusb you would use
> set=5Fconfiguration(2) to set it, whereas on libusb-win32 you would use
> set=5Fconfiguration(1). This is a bit troublesome.
>=20
> We have been hit by this since a device we are using makes the same
> error in reverse, it returns the config descriptor by value instead of
> index, so when windows initially asks for the 0th config descriptor,
> unless there is a bogus descriptor in the device called configuration 0
> (which of course doesn't make sense since config 0 is the unconfigured
> state), the device returns an error. A workaround is to provide 2 config=

> descriptors, one bogus one called 0 and the real one called 1. This is
> fine on linux since you can select config 1 by calling
> set=5Fconfiguration(1), but on windows you have to call
> set=5Fconfiguration(2). If someone decided not to have incrementing
> configuration values you'd be sunk with libusb-win32 at the moment.
>=20
> Anyway, for the moment I'm just happy that I've worked out what's going
> on and that I can select my configuration using 2.
>=20
> Dan
>=20
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